Bug#924049:

[Mateusz Mikołajczyk]

Yes, that is correct, I've read the gitlab entries yesterday. But if you
read them you will find that this is basically a stalemate [gnome calendar
does not support ics files and therefore cannot have the mime but mime is
required to select it on the settings panel] and the problem still persist
- means - despite the fact that you have installed appropriate software
(gnome-calendar) you cannot use it (in terms of integration). Therefore I
thought that it would be more benefitial for the OP if I'd give a (agreed,
hacky) way of OP being able to select the calendar app rather than leaving
the bug without resolution.

regards,

-- 
pozdrawiam serdecznie,
Mateusz Mikołajczyk, a.k.a. toudi
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